Thermal Resistance: Specifically engineered insulation prevents melting or grounding out when routed past hot furnace components

it provides reliable automatic reset functionality for single-stage heating or cooling operations

40VA Load Capacity: Optimized for commercial control circuits

making it a staple for contractors managing residential and light commercial HVAC systems

While designed for Robertshaw ignition controls

Lochinvar & A.O. Smith 100278231 Coupler 30067439-890 Thermal Resistance: Specifically engineered insulationThe Lochinvar & A. O. Smith 100278231 Coupler is a precision engineered pump coupler replacement designed for high performance hydronic and domestic hot water systems. As a critical mechanical link between the motor and the pump assembly, this genuine OEM part ensures smooth torque transmission while compensating for minor shaft misalignments that can lead to premature bearing failure. This specific model is the direct technical replacement for the